Lachlan passed away in January 2010.  As a memorial, this site remains as he left it.
Therefore the information on this site may not be current or accurate and should not be relied upon.
For more information follow this link


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Welcome to Lachlan Cranswick's Personal Homepage in Melbourne, Australia

Are you having internet reliability Problems reaching Bluehaze.com.au in Melbourne, Australia?

Lachlan's Homepage is at http://lachlan.bluehaze.com.au

[Back to Lachlan's Homepage] | [What's New on Lachlan's Page]

[Intro - CranClan] . . [Happening Things] . . [The Daresbury Laboratory Web Ring of Life] . . [NCS - Non-Competitive Scrabble] . . [Garden Gnomes of Daresbury Laboratory] . . [Nature and Local UK Things] . . [USA 2001 and LDEO Columbia University] . . [Historical Literature/Poetry] . . [Music] . . [Misc Things] . . [DL SRS Status] . . [Conference and Travel Things] . . [The Wonders of Team Building] . . [Other People's Homepages] . . [Crystallographic Internet Front] . . [While in Melbourne] . . [Semi Relevant Links]

Announcement - 5th September 2001
  • If you are browsing from Europe and have reliability problems hitting this site, it could be that your network's DNS server has bad defaults for the TTD (Time To Die) on the TCP-IP network packets. As some backbone internet providers in the UK, US and Ausutralia put the incoming TCP-IP packets through a a few dozen internal routers, depending on the time of day, DNS caches, etc; the TCP-IP packet has probably died before it gets here to bluehaze.com.au. Setting a larger default TTD on the DNS server generally fixes this (it may have to be recompiled into the kernel depending on what operating system you are using). E.g., in the following default traceroute from Europe, the packets have bombed near Singapore(?) (did not even make it to Australia as the TCP-IP packets bounced around bbnplanet.net for a dozen hops) (use traceroute -m 50 to increase the number of hops traceroute reports.

    30  POS2-0.paix-core1.ix.singtel.com (202.160.250.46)  177 ms (ttl=233!)  179 ms
     (ttl=233!)  178 ms (ttl=233!)


Further Information Via Tony
  • The Public DNS Service
    • At http://www.granitecanyon.com/
    • "The Public DNS Service is a public service provided by Granite Canyon Group, LLC. The Service offers both primary and secondary DNS free of charge to anyone who asks. The Service maintains UPS protected FreeBSD servers that satisfy DNS queries. The servers are geographically separated and all are connected to the Internet via 7x24 dedicated lines with disjoint routes to the Internet's North American backbones. "


From: tonys 
To: Lachlan Cranswick [l.cranswick@dl.ac.uk]
Subject: Hops

>     Okay - have submitted bluehaze (see below)
>
>    Cheers,
>
>       Tony

    BTW - just talking to [Internet Gure Omega (not real name)] and he rang 
someone in ITS to ask re hop maximums.  Apparently it started out as 16 in 
the early days, then went to 30, and now can be more than this due to 
smart routers or something.

Re our large number of hops, he drew me a diagram of a "router hotel" which
he said is common.  Link comes in from (eg) .au then goes to another router
because this 1st one only handles traffic direct to (eg) .ca, .fr, .za -
this 2nd router similarly doesn't do .uk directly so again it gets passed
onto another one, etc.  Basically a case of what happens when you have to
process 200 domains with only 10 or 15 routers in the rack.

   Cheers,

      Tony


   All information in this post is true in some sense, false in some sense,
   and meaningless in some sense.


[Intro - CranClan] . . [Happening Things] . . [The Daresbury Laboratory Web Ring of Life] . . [NCS - Non-Competitive Scrabble] . . [Garden Gnomes of Daresbury Laboratory] . . [Nature and Local UK Things] . . [USA 2001 and LDEO Columbia University] . . [Historical Literature/Poetry] . . [Music] . . [Misc Things] . . [DL SRS Status] . . [Conference and Travel Things] . . [The Wonders of Team Building] . . [Other People's Homepages] . . [Crystallographic Internet Front] . . [While in Melbourne] . . [Semi Relevant Links]
[Back to Lachlan's Homepage] | [What's New on Lachlan's Page]

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If you are feeling sociable, my new E-mail address is [address now invalid] (replace the *at* with an @ ) . Old E-mail addresses might be giving forwarding or reliability problems. Please use clear titles in any Email - otherwise messages might accidentally get put in the SPAM list due to large amount of junk Email being received. So, if you don't get an expected reply to any messages, please try again.